.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .ab-hero {
  position: relative;
  padding-bottom: clamp(34px, 6vw, 72px);
  background: linear-gradient(176deg, rgba(169, 194, 207, .55) 0%, rgba(169, 194, 207, .16) 44%, rgba(246, 241, 231, 0) 72%);
}

.page-about .ab-hero .breadcrumb {
  padding-top: 16px;
  margin-bottom: 10px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 26px;
  padding-top: 4px;
}

.page-about .ab-hero__lead .kicker {
  margin: 0 0 14px;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 7.2vw, 4.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 16ch;
  text-wrap: balance;
}

.page-about .ab-hero__dek {
  max-width: 36ch;
  margin: 0 0 22px;
  font-size: 1.02rem;
  line-height: 1.85;
}

.page-about .ab-hero__index {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin: 0 0 26px;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-hero__index > div {
  padding-left: 12px;
  border-left: 3px solid var(--ochre-soft);
}

.page-about .ab-hero__index dt {
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--stone);
  margin-bottom: 5px;
}

.page-about .ab-hero__index dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.3;
}

.page-about .ab-hero__figure {
  margin: 0;
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 7%, 100% 0, 100% 93%, 0 100%);
}

.page-about .ab-hero__caption {
  margin-top: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--ochre-soft);
  font-size: .82rem;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .ab-section {
  padding: clamp(40px, 7vw, 84px) 0;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 4.4vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin: 0 0 16px;
}

/* 时间轴 */
.page-about .ab-timeline__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-tl {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--ochre) 0%, var(--ochre-soft) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-left: 44px;
  margin-bottom: 6px;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 16px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--ochre);
  transition: transform .22s var(--ease), background .22s var(--ease);
}

.page-about .ab-tl__item:hover::before {
  transform: scale(1.25);
  background: var(--ochre-soft);
}

.page-about .ab-tl__item details {
  border-bottom: 1px solid var(--line);
  padding-bottom: 4px;
}

.page-about .ab-tl__item summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 10px 30px 10px 0;
}

.page-about .ab-tl__item summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl__item summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 12px;
  font-size: 1.15rem;
  line-height: 1;
  color: var(--ochre);
  transition: transform .2s var(--ease);
}

.page-about .ab-tl__item details[open] summary::after {
  content: "−";
}

.page-about .ab-tl__no {
  display: block;
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--ochre);
  margin-bottom: 4px;
}

.page-about .ab-tl__when {
  display: block;
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--stone);
  margin-bottom: 4px;
}

.page-about .ab-tl__what {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.45;
}

.page-about .ab-tl__item p {
  margin: 4px 0 12px;
  font-size: .93rem;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .ab-timeline__figure {
  margin: 0;
}

.page-about .ab-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-timeline__caption {
  margin-top: 10px;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--stone);
}

/* 团队斜切色带 */
.page-about .ab-band {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin: clamp(30px, 5vw, 64px) 0;
  padding: clamp(54px, 9vw, 100px) 0;
  background: var(--mist);
  color: var(--on-dark);
  clip-path: polygon(0 2.5%, 100% 0, 100% 97.5%, 0 100%);
}

.page-about .ab-band__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .ab-band__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
  filter: grayscale(1) contrast(1.1);
}

.page-about .ab-band__kicker {
  color: var(--ochre-soft);
}

.page-about .ab-band__title {
  color: var(--paper);
}

.page-about .ab-band__lead {
  max-width: 42ch;
  margin: 0;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .ab-band__grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-band__cell {
  padding: 20px 18px;
  background: rgba(246, 241, 231, .08);
  border: 1px solid rgba(246, 241, 231, .28);
}

.page-about .ab-band__no {
  display: block;
  font-family: var(--font-display);
  font-size: .8rem;
  font-weight: 900;
  letter-spacing: .2em;
  color: var(--ochre-soft);
  margin-bottom: 10px;
}

.page-about .ab-band__cell h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--paper);
}

.page-about .ab-band__cell p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--on-dark-soft);
}

/* 核验 */
.page-about .ab-verify__lead {
  max-width: 40ch;
  margin: 0;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .ab-verify__grid {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .ab-verify__item {
  padding-top: 16px;
  border-top: 4px solid var(--ochre);
}

.page-about .ab-verify__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.6vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .ab-verify__item h3 {
  margin: 0 0 6px;
  font-size: .95rem;
  font-weight: 700;
  color: var(--cinnabar-deep);
}

.page-about .ab-verify__item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--stone);
}

/* 沉淀 */
.page-about .ab-scale__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-scale__lead {
  max-width: 40ch;
  margin: 0;
  font-size: .98rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .ab-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-stat {
  background: var(--paper-white);
  padding: 18px 16px;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ochre);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 9px;
  font-size: .84rem;
  line-height: 1.65;
  color: var(--stone);
}

.page-about .ab-ring-wrap {
  padding: 24px 20px;
  background: var(--paper-white);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-sheet);
}

.page-about .ab-ring {
  display: block;
  width: min(230px, 100%);
  height: auto;
  margin: 0 auto 16px;
}

.page-about .ab-ring__val {
  fill: var(--ink);
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 900;
}

.page-about .ab-ring__cap {
  fill: var(--stone);
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .ab-ring__note {
  margin: 0;
  font-size: .86rem;
  line-height: 1.8;
  color: var(--stone);
  padding-left: 14px;
  border-left: 2px solid var(--mist-soft);
}

/* 同路 */
.page-about .ab-partners__grid {
  display: grid;
  gap: 26px;
}

.page-about .ab-partners__lead p {
  margin: 0;
  max-width: 34ch;
  font-size: .96rem;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .ab-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-partner {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .ab-partner:last-child {
  border-bottom: 1px solid var(--line-strong);
}

.page-about .ab-partner__no {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  color: var(--ochre);
  padding-top: 2px;
}

.page-about .ab-partner h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.06rem;
  line-height: 1.4;
}

.page-about .ab-partner p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--stone);
}

/* 下一步 */
.page-about .ab-next {
  margin-top: clamp(30px, 5vw, 60px);
  padding: clamp(38px, 6vw, 70px) 0;
  background: var(--ink);
  color: var(--on-dark);
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
}

.page-about .ab-next__kicker {
  color: var(--ochre-soft);
}

.page-about .ab-next__title {
  color: var(--paper);
  margin-bottom: 4px;
}

.page-about .ab-next__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-next__list a {
  display: block;
  padding: 16px 18px;
  border: 1px solid rgba(246, 241, 231, .26);
  color: var(--on-dark);
  text-decoration: none;
  transition: background .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ab-next__list a:hover,
.page-about .ab-next__list a:focus-visible {
  background: rgba(200, 50, 42, .24);
  border-color: var(--cinnabar);
  transform: translateX(3px);
}

.page-about .ab-next__list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.04rem;
  margin-bottom: 5px;
  color: var(--paper);
}

.page-about .ab-next__list span {
  display: block;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--on-dark-soft);
}

/* 断点 */
@media (min-width: 620px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-verify__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .ab-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .ab-band__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-band__cell {
    padding: 24px 22px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-hero__figure {
    margin-top: 34px;
  }

  .page-about .ab-timeline__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-timeline__figure {
    margin-top: 46px;
  }

  .page-about .ab-scale__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__item::before,
  .page-about .ab-next__list a {
    transition: none;
  }

  .page-about .ab-next__list a:hover,
  .page-about .ab-next__list a:focus-visible {
    transform: none;
  }
}
<<<END>>>